"Baby Mama" **1/2 (out of four): Paper-thin comedy - in which Tina Fey's OCD career woman hires Amy Poehler's ADD surrogate mother - is worth seeing only for its seriously talented comedic leads.

To its credit, "Baby Mama" is not your typical one-joke movie starring "Saturday Night Live" alums. It's more of a one-and-a-half joke movie. In "Mama", Tina Fey's OCD career woman, unable to conceive and unwilling to wait for an adoption, hires Amy Poehler's ADD surrogate mother to carry her baby. How will this odd couple survive nine months together? With hilarious results, of course. Well, moderately hilarious, at least, thanks in large part to its two seriously talented comedic leads.

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